HVAC Heat-Only Wall Thermostat Horizontal for White-Rodgers Lux 9204H ERP

HVAC Heat-Only Wall Thermostat

Horizontal mechanical room thermostat for single-stage gas or electric heating systems. Heat-only SPST control; 24VAC, 2 A maximum; 50–90°F dial range. Manufacturer also lists millivolt compatibility with the required anticipator setup. Not a line-voltage baseboard thermostat. Match the system and wiring to the installation manual.

Part identification

• Catalog vendor: ERP
• Part number: 9204H
• Compatible brands or component references: White-Rodgers; Lux

Cross-reference part numbers

1C20-101, 1C20-102, PSM200, PSM90, 255-401, 255-40A

Brand names identify compatible applications or referenced components; no genuine-OEM manufacture claim is made. Match the original part, full equipment model and configuration before ordering.

Diagnosis

Temperature-control or heat-call problems require diagnosis of the thermostat, wiring and heating system before replacement.

Installation guidance

Disconnect HVAC control power before service. Confirm this heat-only low-voltage thermostat matches the system; never connect it to a line-voltage circuit. Follow the manufacturer's terminal diagram and anticipator instructions for the exact application. Do not jumper across gas-valve or system-control terminals to test. Use a qualified technician if wiring or system compatibility is uncertain.

This is preparation guidance, not a complete model-specific repair procedure.

Manufacturer document for qualified service — confirm document scope and control revision.

Product/application reference 1